For decades, the groundwater has been pumped out of the opencast mines, which has led to the wetlands becoming smaller.
Since the late 1980s, attempts have been made to counteract the consequences of the lowering of the groundwater. First of all, the trench system in the wetland, the Niers, the old Niers, a spring pot and the ring trench were filled with water. Then an attempt was made to raise the groundwater level again using infiltration wells. These are lined up like a string of pearls in the southwest of the wetland.
Approx. 400,000 cubic meters of water are added to the wetland every month. Added to this are the quantities for the artificial Niers spring, which receives more than 300,000 cubic meters per month as the main discharge.
September 9, 2021
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